Ben-Yami, Hanoch2024-05-062024-05-06202310.48550/arXiv.2005.05121https://hdl.handle.net/20.500.14018/14279I explain in what sense the structure of space and time is probably vague or indefinite, a notion I define. This leads to the mathematical representation of location in space and time by a vague interval. From this, a principle of complementary inaccuracy between spatial location and velocity is derived, and its relation to the Uncertainty Principle discussed. In addition, even if the laws of nature are deterministic, the behaviour of systems will be random to some degree. These and other considerations draw classical physics closer to Quantum Mechanics. An arrow of entropy is also derived, given an arrow of time. Lastly, chaos is given an additional, objective meaning.engIndefinite sequencesVaguenessSpacetime structureUncertainty principleIndeterminacyArrow of timeChaosJournal article